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How To Initialize Internationalization For A Polymer Element Before It Loads On Page

Asked By: Anonymous

I am using Dart to build a Polymer app. Since I am using Dart’s internationalization capabilities within Polymer elements, I want to initialize internationalization messages before a Polymer element is created and display the appropriate messages for a given locale within the Polymer element.

How can this be done? Has anyone successfully used Polymer with Internationalization?

ps. I have followed this example to set up internationalization

The following is the default generated Polymer app by Dart Editor plus the code that I’ve added.


library messages_en;

import 'package:intl/intl.dart';
import 'package:intl/message_lookup_by_library.dart';

final messages = new MessageLookup();

class MessageLookup extends MessageLookupByLibrary {

  get localeName => 'en';

  final messages = {
    "myMsg" : () => Intl.message("MY MESSAGE")



library messages_all;

import 'package:intl/message_lookup_by_library.dart';
import 'package:intl/src/intl_helpers.dart';
import 'package:intl/intl.dart';
import 'messages_en.dart' as en;

MessageLookupByLibrary _findExact(localeName) {
  switch (localeName) {
    case 'en': return en.messages;
    default: return null;

initializeMessages(localeName) {
  initializeInternalMessageLookup(() => new CompositeMessageLookup());
  messageLookup.addLocale(localeName, _findGeneratedMessagesFor);
  return new Future.value();

MessageLookupByLibrary _findGeneratedMessagesFor(locale) {
  var actualLocale = Intl.verifiedLocale(locale, (x) => _findExact(x) != null);
  if (actualLocale == null) return null;
  return _findExact(actualLocale);


import 'package:polymer/polymer.dart';
import 'package:intl/intl.dart';
import 'dart:async';
import 'messages_all.dart';
import 'messages_en.dart' as en;

 * A Polymer click counter element.
class ClickCounter extends PolymerElement {
  @published int count = 0;

  @observable var messagesLoaded = false;

  ClickCounter.created() : super.created() {
    var enMessagesFuture = initializeMessages('en');

    Future.wait([enMessagesFuture]).then((_) => messagesLoaded = true);

  void increment() {


<polymer-element name="click-counter" attributes="count">
      div {
        font-size: 24pt;
        text-align: center;
        margin-top: 140px;
      button {
        font-size: 24pt;
        margin-bottom: 20px;
      <button on-click="{{increment}}">Click me</button><br>
      <span>(click count: {{count}})</span>
      <span>current locale: {{Intl.getCurrentLocale()}}</span>
      <template if="{{messagesLoaded}}">
        <span>intl message: {{How can I extract myMsg here?}}</span>
  <a href="http://clickcounter.dart">http://clickcounter.dart</a>


Answered By: Anonymous

I wrote a sample for this, which you can find at
or see under “Polymer and Internationalization”

The essential bit looks like this

// Polymer should call this method automatically if the value of
// [selectedLocale] changes.
void selectedLocaleChanged() {
  // We didn't provide en_US translations. We expect it to use the default
  // text in the messages for en_US. But then we have to not try and
  // initialize messages for the en_US locale.
  if (selectedLocale == 'en_US') {
  // For the normal case we initialize the messages, wait for initialization
  // to complete, then update all (all 1 of) our messages.
      (succeeded) => updateLocale(selectedLocale));

// When the user chooses a new locale, set the default locale for the
// whole program to that and update our messages. In a large program this
// could get to be a large method. Also, other components might want to
// observe the default locale and update accordingly.
void updateLocale(localeName) {
  Intl.defaultLocale = selectedLocale;
  helloWorld = helloFromDart();

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